A Harlem man was caught jumping a subway turnstile while carrying a loaded gun — and he tried to convince cops he was headed to a US Open job fair that happened three weeks earlier.

Jamil Collier, 26, hopped a turnstile at the 116th Street station Friday morning while traveling with his mother, wife, sister and daughter, according to authorities.

Transit Bureau anti-terrorism cops witnessed the act and followed him onto a northbound 6 train at 10:40 a.m.

Officer Jose Garcia and Lt. Alex Amonte made the arrest.

After Officer Jose Garcia and Lieutenant Edwin Reyes got him off the train and onto the platform, Collier was handcuffed for being non-compliant.

Collier claimed he was headed to the job fair for the U.S. Open, police said. But the fair actually took place July 7-8 this year.

Cops found a Ruger-Prescot .380 handgun in his shorts pocket. The gun had six rounds in the magazine.

He is charged with criminal possession of a weapon, theft of service, criminal trespass and disorderly conduct. Collier has 17 prior arrests, including assault, criminal possession of a weapon, and resisting arrest, among other charges.